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Welsh Water are warning of the hidden dangers of reservoirs Credit: ITV News

People across Wales are being warned of the dangers of swimming in reservoirs, as large parts of the country enjoy warm weather in the run up to the Easter bank holiday weekend.

Welsh Water owns and maintains more than 80 reservoirs across Wales and although visitors are welcomed to these recreational sites, they are being warned not to swim in them because of the dangers, which can lead to fatal injuries.

The company has already reported instances of people swimming in some reservoirs in south Wales in the last few weeks including Lower Carno (Ebbw Vale) and Llandegfedd (Usk/Pontypool).

Two people died in Brecon Beacons reservoirs (Ponsticill and Cantref) in one weekend in July 2013.

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Liberal Democrat MP Roger Williams has asked the Prime Minister to consider setting up a not-for-profit energy company based on the model of Glas Cymru which owns Welsh Water. He now says he'll also raise it with Lib Dem Energy Secretary Ed Davey.

Welsh Water is investing £2bn in improving water and sewage services for customers Credit: ITV News

Welsh Water has announced a £2billion investment plan to improve water and sewage services.

The company will hold community events over the next two months to give its customers a say on what improvements are needed.

The plans include replacing 400kn of water mains in Herefordshire, Cardiff and Newport to reduce risk of discoloured water, improving water treatment works with major investments at works serving Llandudno, Colwyn Bay and the Rhondda valleys, and increasing renewable energy generated by the company.

Welsh Water says the fall in profits is due to increased investment Credit: Rui Vieira/PA Wire

Welsh Water's profits have fallen by £9 million in the last year. The company says it is due to increase in investment in the business.

Before tax, the company made a profit of £25 million, down from the £34 million it made last year.

In it's annual results, Welsh Water Dwr Cymru said it had invested £153 million in capital projects in the six months to September 2012 - £40 million more than the same period last year.

Welsh Water has been owned and managed by the not-for-profit company since 2001.

Glas Cymru Chairman, Bob Ayling, said: “I am pleased to report a period of further progress in achieving our objectives; to deliver the best possible outcomes for customers by supplying drinking water of the highest quality and safeguarding the environment, at least cost."

As drought hits parts of the UK, there are calls for Wales to transfer its water further afield.

Severn Trent, which supplies mid Wales, has announced its selling 30 million litres of water to Anglican Water - a company that has had to introduce a hose pipe ban.

Meanwhile, Dwr Cymru Welsh Water says that while it supports transferring water to other regions if it "benefits" its customers and does not "adversely affect" the Welsh environment - the logistics of doing so are "very difficult and extremely expensive."